Frequently or one-time
Change effects all records with …
give a couple of examples.
That’s what I thought.
I would do it in interactive sql
but first make a backup of the file!!! this is likely to take a couple of tries
Set fieldyyy = substring(fieldyyy,1,55)
+ ‘Your Value’
+ substring(fieldyyy, 66, 999
Where 55 was the last char before your change
‘Your Value’ is obviously the new stuff
66 is the start of the unaltered data
999 is the length third part, the length of the record – 65 (or is it 66)